evp_keymgmt_util_copy
if (!evp_keymgmt_util_copy(dup_pk, pkey,
ok = evp_keymgmt_util_copy(to, (EVP_PKEY *)from, SELECT_PARAMETERS);
int evp_keymgmt_util_copy(EVP_PKEY *to, EVP_PKEY *from, int selection);